CPU Usage is getting high

Previously I ran with Couchbase Server 4.5 and Sync Gateway 1.4.1, and it worked well. But after upgrading the couchbase. I am getting this issue after a month.
I am getting a high CPU cycle again. I am not able to understand why it is going high on the very low document count.
We had installed the sync gateway on schedular_details.

Please help me to find out the issue.

Achint Sarkar